Multi-level supporting process and monitoring method for large rock burst roadway

Abstract

The invention discloses a multi-layer supporting process and monitoring method for a large rock burst roadway. The multi-layer supporting process comprises the following steps that starting from the initial support of the roadway, a supporting system with flexible, dynamic and multi-support unit fault-tolerant characteristics is adopted, surrounding rock is used as a bearing body, the viewpoint that the traditional support can only be passively loaded is changed, and the mechanical state of the surrounding rock is improved by multiple means, so that the surrounding rock in a discrete anisotropic state is fully consolidated from a loose state and sublimated from a broken loose soft state into a high-density reinforced homogeneity homogeneous novel surrounding rock body; the shallow part of the surrounding rock is converted into a higher stress potential energy band from a low potential energy band, so that the target of relieving deep high stress transmission or change speed is achieved; and on the basis of continuously improving the strength of the surrounding rock, the loose surrounding rock circle after the roadway is excavated is changed into a real bearing body from a loading body, daily mine pressure monitoring work is carried out in the roadway construction process and after construction is finished, the roadway deformation and the working state of anchor rods can be mastered, and the safety of roadway supporting is ensured.

Description

technical field [0001] The invention relates to the technical field of mine roadway support, in particular to a multi-level support technology and monitoring method. Background technique [0002] With the increase of mining depth in the mining area, the geological conditions of the mine have become more and more complex, and the difficult factors affecting the mine construction have appeared from many aspects, especially the faults of different sizes cut, disconnected and separated the mine field, which brought great difficulties to mine mining. In particular, the fault causes the rocks in the fault section to be broken and the difference in stress increases. At the same time, it often communicates the water in the aquifer in the roof and floor of the coal seam to flow into the fault section, making the broken rock mass in the fault section muddy and rheological, and even forming a water outlet channel. , which brings many difficulties to the normal construction of the mine....

AI Technical Summary

Problems solved by technology

[0002] With the increase of mining depth in the mining area, the geological conditions of the mine have become more and more complex, and the difficult factors affecting the mine construction have appeared from many aspects, especially the faults of different sizes cut, disconnected and separated the mine field, which brought great difficulties to mine mining. In particular, the fault causes the rocks in the fault section to be broken and the difference in stress increases. At the same time, it often communicates the water in the aquifer in the roof and floor of the coal seam to flow into the fault section, making the broken rock mass in the fault section muddy and rheological, and even forming a water outlet channel. , which brings many difficulties to the normal construction of the mine. However, due to the needs of production capacity and mine field layout, the mine must pass through these faults, so as to ensure safe passage of roadway engineering under the action of high pressurized water, mudification, fault fracture zones and asymmetric pressure. It is an important and complicated technical problem in the underground engineering in the world today to control the stability of the surrounding rock through construction, support and post-support. The fault zone under the condition of high pressure water, mudification and asymmetric stress, the traditional The supporting concept, such as steel metal frame shed, ultra-high-strength anchor rod, dense anchor cable and other strong support methods can no longer be adapted, and the roadway under high pressure water, fault fracture zone, muddy and asymmetric stress conditions, generally It has the characteristics of buried deep and high ground stress, mud rheology, extremely soft and broken, easy to fall, etc. After the roadway support is completed, it will still undergo multiple deformations

Images